Speed-regulator



(No Model.)

I H. F. HODGES.

- SPEED REGULATOR.

No. 271,245. Patented Jan.30,1883.

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NITED' STATES PATENT OFFICE.

HORACE F. HODGES, OF CHELSEA, MASSACHUSETTS.

SPEED-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 271,245 dated January 80, 1853,

' Application filed April 26, 1882. (No model.)

having its piston actuated by the motor the speed of which is to be regulated, with a pressure-chamber into which the force-pump discharges, aud a reservoir from which the pump draws its supply, and into which the contents of the pressure-chamber escape under pressure by passing through an orifice leading from the'pressure-chamber to the reservoir, the size ot'which orifice isregulated by a suitable valve, operated either by hand, at the will of the attendant, or automatically. Within the pressure-chamber is a movable piston, with a pistonrod projecting through one or both ends of said chamber and connected to the mechanism or valve by which the source of power of the motor is affected. Between the pump-chainber and its reservoir are suitable check-valves, to allow the liquid to flow freely to the pump from the reservoir, but not in the opposite direction. Between the pump-chamber and the pressure-chamber is also situated acheck valve or valves, to' permit the liquid to pass from the pump to the head of the pressure-chamber, but not in the opposite direction. Between the head of the pressure-chamber and the reservoir is an orifice, the size of which is controlled by a valve, either by manipulation of the operator or automatically by suitable connection from such valve to the piston-rod of the pressure-chamber, and by these means the speed of the motor is regulated by the increase or decrease of the pressure in the pressurechamber caused by the delivery of the pump and relative opening of the orifice between the pressure-chamber and reservoir. To move the piston in the pressurechamber in an opposite direction to the motion produced by the internal pressure from the pump, it is necesview of my improved speed-regulator. Fig.2

represents an end view seen from X in Fig. 1. Fig. 8 represents an end view seen from Y in Fig. 1. Fig. 4 represents a cross-section on the line A B, shown in Fig. 1. Fig. 5 repre sents a crosssection on the line C D, also shown in Fig. 1. Fig.6 represents a longitudinal section on the line E F,shown in Figs. 4 and 5. Fig. 7 represents a longitudinal section on the line G H, shown in Figs 4i and 5; and Fig.8 represents a longitudinal section on the line I K, shown in Figs. 4.- and 5.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

a is the main case or shell, containing the reservoir 6, the force-pump cylinder 0, and the pressure-chamber d, and having closely-fitting heads 2 andfat its ends, as shown.

I) is a removable cover or cap to close the filling-orifice leading to the reservoirb after it is filled with a suitable liquid, preferably a mixture of glycerine and water.

0 is the piston or plunger, fitting within a packing-ring, c, in said cylinder 0; and c is the piston-rod, projecting through suitable stuffing-boxes, c c, in opposite ends of said cylinder, as shown.

g is a connectingrod jointed to the pistonrod 0' in one end, and to a suitable eccentric, cam, or equivalent device on the motor to be regulated, such motor and connecting mechanism beiug,however, not shown in the drawings.

b b are check-valves in the passages b b, leading from the reservoir b to opposite ends of the pump-cylinder c, as shown in Figs. 4, 5, and 6, to admit the liquid to pass freely from the reservoir Z) to the pump-cylinder 0, but not back again. From the pump-cylinder rod d is provided with a regulating-nut, d, and a coiled spring, (i located around said voir 1), whereby the piston d is left free to 0, near the head 0, leads a passage, h, to the pressure-chamber d, and h is a similar passage leading from the opposite end of pumpcylinder 0 to the said pressure-chamber d, and such passages are closed at their common entrance to the pressure-chamber (Z by means of a suitable check-valve, d, to allow the liquid from the pump-cylinder cto pass through either of its passages h h into the pressure-chamber d, but not in an opposite direction.

At the junction of the passages h and h is located a double-actin g check-valve, h, adapted to close one of said passages h h when the liquid fromthe pump is being forced through the other, in this manner preventing the liquid in one end of the pump-cylinder 0 being forced into the opposite end thereof.

Within the pressure-chamber d is located the piston 11, secured to the piston-rod 61', passing through suitable stuffing-boxes, d (1 in opposite ends, as shown. ()ne end of the pistonpiston-rod'd, between the nut (i and its stuffing-box d, as and for the purpose set forth. The opposite end of the piston-rod d is to be connected to the mechanism or valve by which the source of power of the motor is affected, such mechanism being, however, not shown in the drawings, and does not form a part of this invention.

It is the orifice leading from the end of the pressure-chamber d, near the head 6, to the reservoir 6; and 7c is the adjustable gate-valve or block, which is actuated by the screw-spindle k and hand-wheel k, to regulate the size of said orifice 70 according to the amount of speed desired in the motor. Said valve hand-wheel 70' may be connected by means of suitable mechanism to the pressure-chamber piston-rod 01, whereby the said valve k is automatically operated from the said pistonrod d, thereby increasing or diminishing the sensitiveness of this regulator. The opposite end of the pressnre-chamber d has a free passage, l,.leading to the rear end oftheresermove as actuated by the pressure at its opposite end.

The operation of this my improved speedregulator is as follows: Upon the piston 0 being reciprocated the liquid is steadily drawn of the motor is followed by a proportionate increase or decrease of the amount of liquid forced into the pressure-chamber d, andin order for such liquid to pass through the orifice It into the reservoir 1) a proportionately greater or less pressure must exist in the pressurechamher to enable such flow to take place, causing a longitudinal motion of the pressurepiston (1, its piston 01', and connected mechanism or valve, by which the source of the power of the motor is affected. The motion of the piston rod 01' being controlled by the spring d, the latitude of such motion is proportionate to the pressure in the pressurechamber. Any decrease and increasein the siz: of the orifice results in a corresponding decrease and increase in the speed of the motor.

What I Wish to secure by Letters Patent, and claim, is-- In a speed-regulator, the combination of the reservoir 1), closed in both ends, and having valves and passages b b at both ends, leading to corresponding end of the pump-chamber c, in which is arranged the double-acting piston c, the pump-chamber 0, having passages h It, leading from its opposite ends and terminating by a single passage and double-acting valve h at one end of pressure-chamber d,

the elosely-fitting piston 01 within the pressure-chamber d, the piston-rod c, projecting through oneor both ends ofsaid pressure-chamber 01 and provided with the tension-spring al and the regulating-valve It, for regulating the how of the liquid from the pressure-chamber d to the reservoir b through the orifice k, asfand for the purpose set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

HORACE F.-HODGES. Witnesses:

ALBAN ANDREN, HENRY CHADBOURN. 

